Theorem isrhm 14171

Description: A function is a ring homomorphism iff it preserves both addition and multiplication. (Contributed by Stefan O'Rear, 7-Mar-2015.)

Hypotheses

Ref	Expression
isrhm.m	⊢ 𝑀 = (mulGrp‘𝑅)
isrhm.n	⊢ 𝑁 = (mulGrp‘𝑆)

Assertion

Ref	Expression
isrhm	⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) ↔ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) ∧ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ (𝑀 MndHom 𝑁))))

Proof of Theorem isrhm

Dummy variables 𝑟 𝑠 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		dfrhm2 14167	. . 3 ⊢ RingHom = (𝑟 ∈ Ring, 𝑠 ∈ Ring ↦ ((𝑟 GrpHom 𝑠) ∩ ((mulGrp‘𝑟) MndHom (mulGrp‘𝑠))))
2	1	elmpocl 6216	. 2 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → (𝑅 ∈ Ring ∧ 𝑆 ∈ Ring))
3		ringgrp 14013	. . . . . . 7 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp)
4		ringgrp 14013	. . . . . . 7 ⊢ (𝑆 ∈ Ring → 𝑆 ∈ Grp)
5		ghmex 13841	. . . . . . 7 ⊢ ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → (𝑅 GrpHom 𝑆) ∈ V)
6	3, 4, 5	syl2an 289	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) → (𝑅 GrpHom 𝑆) ∈ V)
7		inex1g 4225	. . . . . 6 ⊢ ((𝑅 GrpHom 𝑆) ∈ V → ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))) ∈ V)
8	6, 7	syl 14	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) → ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))) ∈ V)
9		oveq12 6026	. . . . . . 7 ⊢ ((𝑟 = 𝑅 ∧ 𝑠 = 𝑆) → (𝑟 GrpHom 𝑠) = (𝑅 GrpHom 𝑆))
10		fveq2 5639	. . . . . . . 8 ⊢ (𝑟 = 𝑅 → (mulGrp‘𝑟) = (mulGrp‘𝑅))
11		fveq2 5639	. . . . . . . 8 ⊢ (𝑠 = 𝑆 → (mulGrp‘𝑠) = (mulGrp‘𝑆))
12	10, 11	oveqan12d 6036	. . . . . . 7 ⊢ ((𝑟 = 𝑅 ∧ 𝑠 = 𝑆) → ((mulGrp‘𝑟) MndHom (mulGrp‘𝑠)) = ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆)))
13	9, 12	ineq12d 3409	. . . . . 6 ⊢ ((𝑟 = 𝑅 ∧ 𝑠 = 𝑆) → ((𝑟 GrpHom 𝑠) ∩ ((mulGrp‘𝑟) MndHom (mulGrp‘𝑠))) = ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))))
14	13, 1	ovmpoga 6150	. . . . 5 ⊢ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring ∧ ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))) ∈ V) → (𝑅 RingHom 𝑆) = ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))))
15	8, 14	mpd3an3 1374	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) → (𝑅 RingHom 𝑆) = ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))))
16	15	eleq2d 2301	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) → (𝐹 ∈ (𝑅 RingHom 𝑆) ↔ 𝐹 ∈ ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆)))))
17		elin 3390	. . . 4 ⊢ (𝐹 ∈ ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))))
18		isrhm.m	. . . . . . . 8 ⊢ 𝑀 = (mulGrp‘𝑅)
19		isrhm.n	. . . . . . . 8 ⊢ 𝑁 = (mulGrp‘𝑆)
20	18, 19	oveq12i 6029	. . . . . . 7 ⊢ (𝑀 MndHom 𝑁) = ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))
21	20	eqcomi 2235	. . . . . 6 ⊢ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆)) = (𝑀 MndHom 𝑁)
22	21	eleq2i 2298	. . . . 5 ⊢ (𝐹 ∈ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆)) ↔ 𝐹 ∈ (𝑀 MndHom 𝑁))
23	22	anbi2i 457	. . . 4 ⊢ ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ (𝑀 MndHom 𝑁)))
24	17, 23	bitri 184	. . 3 ⊢ (𝐹 ∈ ((𝑅 GrpHom 𝑆) ∩ ((mulGrp‘𝑅) MndHom (mulGrp‘𝑆))) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ (𝑀 MndHom 𝑁)))
25	16, 24	bitrdi 196	. 2 ⊢ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) → (𝐹 ∈ (𝑅 RingHom 𝑆) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ (𝑀 MndHom 𝑁))))
26	2, 25	biadanii 617	1 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) ↔ ((𝑅 ∈ Ring ∧ 𝑆 ∈ Ring) ∧ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹 ∈ (𝑀 MndHom 𝑁))))

Syntax hints:   ∧ wa 104   ↔ wb 105   = wceq 1397   ∈ wcel 2202  Vcvv 2802   ∩ cin 3199  ‘cfv 5326  (class class class)co 6017   MndHom cmhm 13539  Grpcgrp 13582   GrpHom cghm 13826  mulGrpcmgp 13932  Ringcrg 14008   RingHom crh 14163

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635  ax-cnex 8122  ax-resscn 8123  ax-1cn 8124  ax-1re 8125  ax-icn 8126  ax-addcl 8127  ax-addrcl 8128  ax-mulcl 8129  ax-addcom 8131  ax-addass 8133  ax-i2m1 8136  ax-0lt1 8137  ax-0id 8139  ax-rnegex 8140  ax-pre-ltirr 8143  ax-pre-ltadd 8147

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-nel 2498  df-ral 2515  df-rex 2516  df-reu 2517  df-rmo 2518  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-int 3929  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-riota 5970  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-map 6818  df-pnf 8215  df-mnf 8216  df-ltxr 8218  df-inn 9143  df-2 9201  df-3 9202  df-ndx 13084  df-slot 13085  df-base 13087  df-sets 13088  df-plusg 13172  df-mulr 13173  df-0g 13340  df-mgm 13438  df-sgrp 13484  df-mnd 13499  df-mhm 13541  df-grp 13585  df-ghm 13827  df-mgp 13933  df-ur 13972  df-ring 14010  df-rhm 14165

This theorem is referenced by:  rhmmhm  14172  rhmghm  14175  isrhm2d  14178  rhmf1o  14181  rhmco  14187  resrhm  14261  resrhm2b  14262  rhmpropd  14267